The pun, largely credited as the greatest pun of all time, was first used in 1979 when Margaret Thatcher’s Conservative Party placed an advertisement in the London Evening News after her election win that stated “May the Fourth Be with You, Maggie. Congratulations,”

May 4th wasn’t observed as a holiday, however, until a group in Toronto, Canada organized a celebration in 2011. The event has gained traction every year since then and last year Disney celebrated the holiday with several Star Wars festivities and more.